METHOD AND APPARATUS FOR IMPROVING THE CODING OF SIDE INFORMATION REQUIRED FOR CODING A HIGHER ORDER AMBISONICS REPRESENTATION OF A SOUND FIELD

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EP 4 554 255 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	25.06.2025 Bulletin 2025/26

(43)	Date of publication A2:
	14.05.2025 Bulletin 2025/20

(21)	Application number: 25158678.0

(22)	Date of filing: 19.12.2014

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International Patent Classification (IPC):

G10L 19/008^(2013.01)

H04S 3/00^(2006.01)

(52)	Cooperative Patent Classification (CPC):
	G10L 19/008; H04S 3/008; H04S 2420/11

(84)	Designated Contracting States:
	AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

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Priority:

08.01.2014 EP 14305022
16.01.2014 EP 14305061

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	22176389.9 / 4089675
	19208682.5 / 3648102
	14815731.6 / 3092641

(71)	Applicant: Dolby International AB
	Dublin, D02 VK60 (IE)

(72)	Inventors:
	KORDON, Sven 31515 Wunstorf (DE) KRUEGER, Alexander 31303 Burgdorf (DE) WUEBBOLT, Oliver 30559 Hannover (DE)

(74)	Representative: Dolby International AB Patent Group Europe
	77 Sir John Rogerson's Quay Block C Grand Canal Docklands Dublin, D02 VK60 Dublin, D02 VK60 (IE)

(54)	METHOD AND APPARATUS FOR IMPROVING THE CODING OF SIDE INFORMATION REQUIRED FOR CODING A HIGHER ORDER AMBISONICS REPRESENTATION OF A SOUND FIELD

(57) Higher Order Ambisonics represents three-dimensional sound independent of a specific loudspeaker set-up. However, transmission of an HOA representation results in a very high bit rate. Therefore compression with a fixed number of channels is used, in which directional and ambient signal components are processed differently. For coding, portions of the original HOA representation are predicted from the directional signal components. This prediction provides side information which is required for a corresponding decoding. By using some additional specific purpose bits, a known side information coding processing is improved in that the required number of bits for coding that side information is reduced on average.

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